Originally Posted by ov845
We live in IL and it's our understanding that it goes by axle weight. When hooked up to a trailer, it's the weight of the combined tow vehicle's axles hitch/pin is included not the total weight of the trailer since it has has its own axles. So if your GAWR on the tv combined is over 8K lbs. then you have to move up to D plates or higher. That info is on he white sticker on the driver door or door frame. Some IL State Police cars have portable scales that the troopers can use to weigh trucks/RVs.
2012 Ram 1500 Crew Cab 5'7" Bed
4 X 4 Engine 5.7L Hemi Gear 3.92
2015 2809W Windjammer (Diamond Package)
Husky Centerline WDH
For a tow vehicle only, it goes by the actual weight of the vehicle. If you have 8k lb plates and you weigh 9k lbs, you are overweight. GVWR plays no role. It is the actual weight. You can register a 15,000 lb GVWR vehicle with 8k lb plates. As long as that vehicle never actually weighs more than 8k lbs it is not overweight. Hard to do in my extreme example, but illustrates the point.
For TV and trailer, the combined weights AND the combined registration is used. If combined, the truck and trailer weighs 13k lbs and the combined registration allows for 15k lbs, you are not overweight... even if the truck weighs 9k lbs on 8k plates and the trailer weighs 4K lbs with 7k lbs or more of plates.